This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.
|Pseudoclavihedbergella chevaliensis Falzoni et al. 2016|
See also: Hedbergella amabilis - type species;
Diagnosis.– Tests low trochospiral, with globular chambers in early stage and radially elongate, petaloid shaped chambers in adult stage; ornamentation consists of scattered pustules.
Description.– Tests are low trochospiral, with chambers that gradually increase in size. Chambers of the juvenile stage globular; the last formed ones are radially elongate and petaloid in shape, with the long axis perpendicular to or at a high angle (> 75°) to the previous whorl. Sutures are distinct and depressed, often limbated due to the lack of chamber overlapping. Periphery broadly rounded, simple or, rarely, with a peripheral band of low pore density and smaller pore size on the earlier chambers of the final whorl. Aperture is a low to medium high arch, umbilicalperipheral in position and bordered by an imperforate lip; relict periapertural structures and apertures can be present in the umbilicus. Chamber surface ornamented with dome-like scattered pustules, denser on the earlier chambers. Test wall calcitic, hyaline and perforate; pores show gradual increase in size along the lineage.
Etymology: The Greek prefix “Pseudo-“ (= false) is added to the preexisting genus name Clavihedbergella.
Extra details from original publication
Remarks.– Pseudoclavihedbergella differs from Clavihedbergella by the pustulose chamber surface and radially elongate chambers that are petaloid in shape and with the elongation axis perpendicular to or at a high angle to the previous whorl, rather than subcylindrical and tangentially elongate. The simple test wall differentiates Pseudoclavihedbergella from the tests with radially elongate chambers of the upper Turonian, which were assigned to Hillsella Georgescu, 2008 and described as cancellate; however, a different terminology is needed for such tests (Georgescu, 2008b). Eohastigerinella lineage of the Santonian consists of E. subdigitata and E. watersi as ancestor and descendant respectively. The test wall of the Eohastigerinella species is simple, similar to those of Pseudoclavihedbergella, but the former lineage exhibits a well-developed trend to toward planispiral tests.
Pseudoclavihedbergella compiled by the pforams@mikrotax project team viewed: 27-2-2021
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